Most of the Alpha 2 to Alpha 3 transitions didn’t even make sense.
As mentioned, Bison went from wanting to brainwash Ryu to actually taking his body for himself.
Alpha 2: Adon basically got secondhand intel on the Muay Thai fighter being defeated by Akuma, realized that he wielded the same fighting style as Ryu, and made it a point to find and defeat Akuma to prove the greatness of Muay Thai. He had a visualization of Akuma, so I’m assuming he saw him fight before.
Alpha 3: Adon goes from simply wanting to defeat Akuma…to wanting to learn the Satsui no Hado **and ** the secrets of the Shun Goku Satsu to *assimilate *it with Muay Thai. How he even knew what the Shun Goku Satsu was, I have no idea. I dunno if he was expecting to learn this through fighting Akuma or he assumed he was tough enough to make Akuma teach it to him. Either way, that’s one hell of a shift in the story from Alpha 2 to Alpha 3.
Alpha 2: Rose goes to stop Bison from further abusing his Psycho Power. Bison totally disregards her and mocks her. She temporarily succeeds at defeating him, but failed because Bison was still around.
Alpha 3: Rose now realizes the importance of finding Bison and putting an end to him…even if it means sacrificing her own life. Rose basically admits she regrets things ending up how they did because Bison “was her master”. Yes, she did not just try to take him out in the previous game. Rose basically went from treating Bison as if he was just a madman with power to regarding Bison as her “master”. He then appears to take her body over.
Alpha 2: Sagat basically goes off and does his own thing in his ending.
Alpha 3: Sagat continues to blow off Bison’s invitations to join Shadaloo.
Street Fighter 2: Sagat is one of the 4 Kings.
Ryu’s transition is one that actually makes sense. He learned of the Satsui no Hado in Alpha 2, but his journey in Alpha 3 consisted of him wanting to learn more about this power. Other than that, story-wise, Alpha 2 seems like a better end to the Alpha arc than Alpha 3, imo. I definitely like a lot of stuff in Alpha 3, though.